Write-up: Immediately after injection complained of severe pain at site. Fell off table and fainted for approximately 10 - 15 seconds. Hyperventilated and cried progressing Chvostek''''s sign in hands and feet. Rebreathing into a bag progressing to clearing of sympto"ms. Complained of headache, blurry vision; Vision test was normal. Vomiting x 1 in parking lot and speech was momentarily inarticulate. Sent to ER. At ER neuro exam was normal except for word recall /"coffee instead of coughing/" /"Sired instead of tired.